The whole or local part machining distortion caused by cutting is a common problem in the machining filed, and it is more serious to aeronautic and astronautic products. For the large structure and a long period of time in machining, geometry distortion may be caused, which makes them not satisfy the design aim, sometimes, they maybe turn into waster, so the problem of machining distortion affects the throughput and operating costs of aeronautic and astronautic products seriously. That is, this t...